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- The commit f79a4611 introduced query_hdl, which is the read pipe handle kept in the write pipe instance in order to determine if the pipe is ready to write in select(). This implementation has a potential risk that the write side fails to detect the closure of the read side if more than one writer exists and one of them is a non-cygwin process. With this patch, the strategy of commit f79a4611 is used only if the process is running as a service. For a normal process, instead of keeping query_hdl in the write pipe instance, it is retrieved temporarily when select() is called. Actually, we want to use tenporary query_hdl for all processes, however, it does not work for service processes due to OpenProcess() failure.
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